This article provides a quick tour of Oracle's Transactional Event Queues (TEQ) and so attempts to cover as much as possible at a high-level while giving quick, low-level, and code examples at the same time. There is quite a bit of material, and there are multiple workshops related to TEQ and its use in modern application development and microservices that can be found at the end of this piece.
This article corresponds to a 12-minute video that can be found here...
Oracle Transactional Event Queues (previously known as Advanced Queueing) has been around and widely used for decades (long before Kafka) and is well-harden technology. Here is a timeline to give an idea.